IUPAC Naming

[justadream]

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In the molecule above, the nitrogen is given the "4" position. So that implies that the oxygen is given the "1" position, correct?

 

[The Brown Knight]

The oxygen has the "1" position
The nitrogen has the "3" position
The dimethylated carbon has the "4" position

 

[justadream]

@TheBrownKnight

What if one of the methyl groups were replaced with a heptyl group? Would that change the ordering (since the longest chain would differ)?

 

[justadream]

Also, in DNA/RNA, why does the naming start from the carbon (not from the oxygen like in this molecule)?